api: use fmt.Fprint/Fprintln

Honestly I didn't know it existed at the time of writing gtranslate :)

api.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"net/http"
 )
 
@@ -28,6 +29,6 @@ func CreateApiHandler(settings *TranslateSettings) func(w http.ResponseWriter, r
 			return
 		}
 
-		w.Write([]byte(translation))
+		fmt.Fprint(w, translation)
 	}
 }

utils.go

@@ -7,5 +7,5 @@ import (
 
 func writeError(w http.ResponseWriter, status int, err interface{}) {
 	w.WriteHeader(status)
-	w.Write([]byte(fmt.Sprintln(err)))
+	fmt.Fprintln(w, err)
 }